In the video below Doc runs some commercial concentrates through the Multi-Sluice. The points… #1 The SPEED in which this happens often amazes people. What used to take people hours and hours to do now literally takes minutes. #2 The varying sizes of gold caught in the sluice at the same time is impressive. #3 The stripping mode is truly amazing. SOME… don’t understand the theory. It’s NOT about trying to catch every single grain of gold. Since it only takes about 30 seconds to do this step, you can repeat it 2-3 times. But stripping it down to almost pure gold is amazing.